CompressionConfig: add missing constness

Author: pcanal

core/zip/inc/Compression.h

@@ -161,27 +161,33 @@ class CompressionConfig
       delete [] fConfigArray;
    }
 
-   Int_t GetCompressionSettings() {
+   Int_t GetCompressionSettings() const
+   {
       return CompressionSettings(fAlgorithm, fLevel);
    }
 
-   Int_t GetCompressionLevel() {
+   Int_t GetCompressionLevel() const
+   {
       return fLevel;
    }
 
-   RCompressionSetting::EAlgorithm::EValues GetCompressionAlgorithm() {
+   RCompressionSetting::EAlgorithm::EValues GetCompressionAlgorithm() const
+   {
       return fAlgorithm;
    }
 
-   Int_t GetNConfigArray() {
+   Int_t GetNConfigArray() const
+   {
       return fNConfig;
    }
 
-   Char_t *GetConfigArray() {
+   Char_t *GetConfigArray() const
+   {
       return fConfigArray;
    }
 
-   Int_t GetNPrecisionCascade() {
+   Int_t GetNPrecisionCascade() const
+   {
       return fNPrecisionCascade;
    }
 

tree/tree/inc/TBranch.h

@@ -288,7 +288,7 @@ class TBranch : public TNamed, public TAttFill {
            void      SetCompressionAlgorithm(Int_t algorithm = ROOT::RCompressionSetting::EAlgorithm::kUseGlobal);
            void      SetCompressionLevel(Int_t level = ROOT::RCompressionSetting::ELevel::kUseMin);
            void      SetCompressionSettings(Int_t settings = ROOT::RCompressionSetting::EDefaults::kUseCompiledDefault);
-           void      SetCompressionSettings(ROOT::CompressionConfig &config);
+           void      SetCompressionSettings(const ROOT::CompressionConfig &config);
    virtual void      SetEntries(Long64_t entries);
    virtual void      SetEntryOffsetLen(Int_t len, bool updateSubBranches = false);
    virtual void      SetFirstEntry(Long64_t entry);

tree/tree/src/TBranch.cxx

@@ -2862,7 +2862,7 @@ void TBranch::SetCompressionSettings(Int_t settings)
 ////////////////////////////////////////////////////////////////////////////////
 /// Set compression settings based on a ROOT::CompressionConfig
 
-void TBranch::SetCompressionSettings(ROOT::CompressionConfig &config)
+void TBranch::SetCompressionSettings(const ROOT::CompressionConfig &config)
 {
    fNCompConfig = config.GetNConfigArray();
    fCompConfig = new char[fNCompConfig];